摘要： 为保障UPS与电网之间平滑可靠地进行切换和负载电压波形不发生畸变，UPS逆变器输出电压和电网电压的频率、相位必须保持一致。该文研究了基于多周期调节原理，采用数字信号处理器芯片TMS320LF2407A实现软件锁相环的设计方法，实现逆变输出电压对市电电压的可靠跟踪，并给出了软件设计流程图和硬件电路。实验结果验证了该方法的有效性和可行性。

关键词: 锁相环, 数字信号处理器, 不间断电源

Abstract: The out voltage of the inverter in an uninterruptible power supply should be kept in frequency and phase with the electric network in order to hold the smooth swapping and the voltage on the load steady. This paper designs multicycle regulative software phase locked loop based on DSP TMS320LF2407A. The implementation of both software and hardware is presented. The experimental results verify the feasibility and validity of the proposed method.

Key words: Phase Locked Loop(PLL), DSP, Uninterruptible Power System(UPS)

中图分类号: 

• TP303